Demonstrators picketing against the arrival of undocumented migrants who were scheduled to be processed at the Murrieta Border Patrol Station block the buses carrying the migrants in California

Demonstrators picketing against the arrival of undocumented migrants who were scheduled to be processed at the Murrieta Border Patrol Station block the buses carrying the migrants in Murrieta, California July 1, 2014. Some 140 undocumented immigrants, many of them women with children, will be flown from Texas to California and processed through a San Diego-area U.S. Border Patrol station as federal officials deal with a crush of Central American migrants at the border, a local mayor said on Monday. REUTERS/Sam Hodgson (UNITED STATES - Tags: SOCIETY IMMIGRATION CIVIL UNREST)

Migrant standoff in California

Senate Democrats on Tuesday circulated legislation to significantly cut President Barack Obama's request for emergency funding to deal with an influx of Central American children streaming across the U.S. border with Mexico.

Struggling to deal with the issue before Congress' August break, Democrats floated a measure that also would provide immediate aid to Israel for the Iron Dome missile defense system as well as money needed to fight wildfires in Western states.